TOPSHOTS Emergency responders help evacuate a Syrian boy from a residential building reportedly hit by an explosives-filled barrel dropped by a government forces helicopter in the Shaar neighbourhood of the northern Syrian city of Aleppo on Arpil 6, 2014. More than 150,000 people have been killed in Syria's three-year war, with half the population estimated to have fled their homes. AFP PHOTO/KHALED KHATIB